A refractory material generally refers to an inorganic non-metallic material having a refractoriness of 1580 ° C or more. It includes natural ores and various products made through certain processes according to certain purposes. It has certain high temperature mechanical properties and good volume stability, and is a necessary material for various high temperature equipment. It is very versatile.

Second, the type of refractory materials?

1. Acid refractory material generally refers to refractory material with SiO2 content greater than 93%. Its main feature is that it can resist the erosion of acid slag at high temperature, but it is easy to react with alkaline slag. Silica bricks and clay bricks are commonly used for acid refractories. Silica brick is a siliceous product containing more than 93% of silicon oxide. The raw materials used are silica, waste silicon brick, etc., which have strong resistance to acid slag erosion, high load softening temperature, no shrinkage after repeated calcination, and even slight expansion; However, it is susceptible to corrosion by alkaline slag and has poor thermal shock resistance. Silica bricks are mainly used in thermal equipment such as coke ovens, glass melting furnaces, and acid steelmaking furnaces. Clay bricks are mainly made of refractory clay and contain 30% to 46% of alumina. They are weakly acidic refractories, have good thermal shock resistance, and are resistant to acid slag.

3. Aluminosilicate refractory refers to refractory material with SiO2-Al2O3 as the main component. According to its Al2O3 content, it can be divided into semi-silica (Al2O3 15~30%) and clay (Al2O3 30~48%). , high aluminum (Al2O3 is greater than 48%) three categories.

4. Melt-casting refractory material refers to a refractory product having a certain shape after being melted at a high temperature by a certain method.

5. Neutral refractory refers to refractory materials that are not easily reacted with acidic or alkaline slag at high temperatures, such as carbon refractories and chrome refractories. Some also attribute high alumina refractories to this category.

6. Special refractory materials are new inorganic non-metallic materials developed on the basis of traditional ceramics and general refractory materials.

7. Unshaped refractory material is a mixture of refractory aggregate and powder, binder or additional admixture. It can be used directly or with appropriate liquid. The amorphous refractory material is a new refractory material which is not calcined and has a refractoriness of not less than 1580 °C.